Câu 2: Để nhận biết 2 chất bột màu trắng là BaCO3 và BaSO4 người ta sử dụng dung dịch nào sau đây làm thuốc thử? A. NaOH B. AgNO3 C. HCl D. AgNO3

Choose the best answer.

I think you should buy _____  pack of mineral water instead. And you can also buy _____  snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______  cookies and soft candies.

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.